Air-cooled engine.



Patented June 21, 1910.

Snventoz W1 in coma WILLIAM J. MILLER, OF SPRING-FIELD, OHIO, ASSIGNOR, BY MESNE ASSIGNMENTS, TO THE KELLY MOTOR TRUCK COMPANY, OF SPRINGFIELD, OHIO, A CORPORA'IION OF OHIO.

.AIR-COOLED ENGINE.

Specification of Letters I'atent.

Application filed. May 11, 1908. Serial No. 432,142.

To all whom it may concern:

Be it known that I, WILLIAM J. MILLER, a citizen of the United States, residing at Springfield, in the county of Clark and State of Ohio, have invented certain new and useful Improvements in Air-Cooled Engines, of which the following is a specification.

My invention relates to improvements in explosive engines and especially to that class of engines which is designed for use in automobiles and the type known as air cooled.

The invention particularly relates to arrangements for cooling the cylinder and the exhaust ports and pipe in that type of engines such as the two-cycle type in which the exhaust and supply is'regulated by the piston or means within the cylinder.

My invention consists in the construction and combinations hereinafter described and set forth in the claims;

In the accompanying drawings Figure 1 represents the cylinder with the exhaust and supply ports of a two-cycle engine to which my invention is applied. Fig. 2 is a transverse sectional view of the cylinder. Fig. 3 is a side elevation of the same. Figs. 4: and 5 are views of the cylinder and jacket separate.

Like letters of reference represent like parts throughout the several views.

In the said drawings a represents the cylinder, the extended portion a of which is provided with the inlet ports a and the outlet or exhaust port a There are preferably two of the inlet ports a one only be in shown, the other being on the opposite si e of the cylinder and access to these ports from the supply pipe I) is had through a chambered casing 6 a passage 6 being formed therein extending partly around the cylinder to connect with the ports. A passage b is alsoformed leading from the exhaust port a and from thence to the exhaust pipe 6. This chambered casing 72 is preferably made in two parts adapted to be bolted together around the cylinder which it fits, this particular construction, however, forming no part in my invention. The cylinder is provided on the outside with a series of projections a. which may be in the form a of ribs, as shown, or other usual forms such as spikes or studs. At the top of the cylinder are a series of radial pro ections a? and these projections are turned 0 at their outer ends concentric with the cylinder. Surrounding the upper part of the cylinder and extending down to a point near the chambered casing b is a jacket 0 which forms with the outer part of the cylinder, an air chamber, through which the air is forced for cooling the cylinder. This jacket 0 is closed at the top except for an opening 0 and is open at the bottom. This opening 0 is eccentric to the casing and is adapted to set on the top of the cylinder immediately over the projections a The inner part of the casing is recessed slightly concentric with the opening 0 and adapted to fit over the ends of the projections a which hold the casing in place in its eccentric position about the cylinder and permits it to be readily removed. At the top of the casing c is the air conduit 0 which is connected b a pipe 0 to a suitable blower or fan in icated at c". A clamping-bolt 0 serves to hold the conduit and jacket in position on the cylinder. It will be understood that any number of cylinders can be attached to the fan, each of the casings being arranged in the eccentric manner shown. By this arrangement the air from the source of supply is forced onto the cylinder and passes down along the cylinder. By the eccentric arrangement of the casing a comparatively large assage for the air is forme on that side rom which leads the exhaust ports and a small amount is distributed around the other parts of the cylinder. The exhaust port is also arranged over the supply so that it is intermediate the two air strata, that which is formed by the air passing through the enlarged passage of the air chamber and that of the incomin charge which also has a tendency to coo the exhaust. This particular arrangement of parts is found very efl'ective in air cooled, engines of this type.

It is obvious that any suitable blower may be employed and driven from any source generally from the engine shaft, in the usua way, the particular means for supplyingthe ort being located inter-- said supply ort or passage and in proximity to the atter, as and for the purpose specified. 1

2. In a two-cycle air cooled engine, a cylinder, an eccentrically 7 arranged casing around said cylinder, an exhaust port leading from said cylinder below sa1d casing,

and means for supplying air to the upper portion of said casm whereb a larger supply of air is directe along tlie cylinder on the side immediately above the exhaustport, asand for the purpose specified.

3. In combination with the cylinder of a two-cycle engine, an eccentrically arranged casing fitting over said cylinder, projections on sa1d cylinder extending into the air s ace, an exhaust and supply for said cylinder both arranged below the eccentrically arran ed casing, the exhaust port being interme iate the casing and the supply port, as and for the purpose specified.

4. In a two-c cle air cooled inder having ribs or radially arranged projections at the to of said cylinder concentric with said cylinder, a casing having an eccentric opening and recessed to fit said projections, and means for removably connecting said casing to said cylinder, as and for the purpose s ecified. v. v

In testimony w ereof I have hereunto set my hand this 2nd day oi May, 1908.

WILLIAM J. MILLER.

engine, a cyl- 

